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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63f004a7c5e1577e0349fc9f7525788ed1d9e7a2ca9bf97860f5f6d52257af63' 
  AND token = '9uR6k7ZCCGdWhFbaaMXlva5Za0FpFPMVTMBDf4/rCZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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