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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '601e763ed72adbb54f61ad7aefe22de73f7a310d4b13adf34e07703e90a18c2a' 
  AND token = 'sg6d7gu0w5YZBTuarOhC8ZuBNW49+BK5pbZhmVToJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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