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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9900ea01e8d735fe1cc47686376778cccf4d17a21bfa41ed9383628dda5c11' 
  AND token = 'SCX3F1/joXH9bmbl9jsIS2Rm6qQYkoTLVF5+7EsFIhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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