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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c29af2c2a87e4bda9350278e850dfc6eabfd47f0adb68845483bb26f78cfdb05' 
  AND token = '2fXVKOGct/lwcBeieXh1MF+YS/7n16OTRU/yVymW6bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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