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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139aab330d9492c4380fa6391700ec23c0528f8f49c33ce92dc3740d257d8e0f' 
  AND token = '+P1bvTo4xrKKipqCT42oDk5FR8GsVn68D2eXvCIsCEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}