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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a56713e994074b56f63bc06e34dcc78657c135cfb788073cd92e9676e675fce' 
  AND token = '48tJMUJoXhxsPQJ3FSzBtXnlwJo4T863+M4D/b+GyNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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