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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd83a96975597a73b6b76b2ebe734c84f5cf6589f473020e56905082fe197434e' 
  AND token = 'drz9GJAUyeJXy8HK9CSZQXks7VkIXzeNVLqLhdpvNZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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