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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a4ada5be378871c61a583c1b7c7b371318feb1d8a86e7d2666210919441d67' 
  AND token = 'VGorCzFk94dVdVBwqGetAlAkiG68HNaUAK0Cf7Zu1Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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