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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12a9eab45fb03bc80cb27f3d3211a01e6fe44fa655e263c41abc4fd8bb326359' 
  AND token = '0A4d3AR6mXLpI19mfsYURdqVYawLMHAZ1Zfsxg/Ml/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00318

JSON explain

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