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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7afaf47dceb78ac0ed5d9bcced247f985e924060c992c1a92a29452fe2407ef6' 
  AND token = 'ZAv4VrJw0Tm+o447G2SfNSssJtlwyEOtqi0nV92AAvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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