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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb3c8d11d057433daa3cf9be7c4016f5b036df143f4ca06dd07b680eb76e0f9f' 
  AND token = 'su5gZKA87okmqyFbC4UzGmhfKmeDs9tBkGJ3IllY7po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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