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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a847e532a3590f44ea97c35b234bb1b0e197d35d38e77087847fe89bf998189b' 
  AND token = 'uyxopXN3y7rO1xz7fz0u92ZWIOl6fbvAAwzHRUj3vWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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