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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb7fde2bb85c80263153d40460b674772bb80580669ea22bf747423a08d5d7c' 
  AND token = 'uiZY4jVb6R0HCmjmHCABUq08Yc9TJyUt0iNxlpBQ1OI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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