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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471fb8037908fb1e09192bc6f6417382445b07c54e79ace05f476de4014fd79f' 
  AND token = 'ucKQai9RGEPM8yCcQIN0u5EriTgo+n9SM128bC/nQmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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