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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc0da005aa873d5c36bd89af53e7d0a600697c79f7a54ebe7f12b58d347903b' 
  AND token = 'O1Z/uMALSEVBSu9rGs6BNItvbgjv6CmdemTeZVkPXs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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