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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b6d49e43786907ac5564c07b65aa4075dabecb6a743e696c9d10df932f50d' 
  AND token = 'bZ/e9YaoKZJRNyhYUx0sy1flJU8c/W0Jm9qrYwT6WZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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