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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ab82ed327387de11d4ea5becf2c3c44c7b2ef5d90a1238e62558c78d4dcd365' 
  AND token = 'cpxAb83lCDtG61ZvsoghwvohjWWU2xyIz3gFzkpgns0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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