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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7a8c4caa6c2011e4baada3afa232bd8b1d06e1f51f66e0b71776410037f8b7c' 
  AND token = 'ZQnltrJRA0FW+oMBzh56ojbY2FOgpjww47KaLWKxMr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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