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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f75d6b8b44ee8b8ab77848a7cc422dc5591500e96d6c315b8a5b956a6acb32c5' 
  AND token = 'sk3H/QNyDJPZcioX3t7CDYMlwTK7iqUmzvdQOxXYdbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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