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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390efb6d6978b399a7019d6ae3ed3e80035007270786a7916d6a95485156d3f9' 
  AND token = 'xuEf945e9lFDtYJwUZBdRLO0OM4lqlyeRPvsQaqlpSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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