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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11eaa7bb32d0f9a7bb5ed1cf1722e90c8c8c7fb818a18c362f42e10f1b8d78dd' 
  AND token = 'q73r1JMC3sbZ4J+JEv0rKj1izhkz5WgPT0XB1NyGRUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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