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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7f1f827ad3cae55283a0fc90d975dc7f86ee5122be4d8ac2d282d58822ebe00' 
  AND token = 'pYVA74TN2EbDV0PdwOyYkh6vWGqmWrxQNJo+5A8GIIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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