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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bb697ef26fe4c8a7c882cae506544370ffbcefa91b00071da606ff5637dc2c4' 
  AND token = 'Q3EW2LFnQy+LPhto9O40IXHjmqLLAyxtxHlXPHeTRZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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