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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad5351cae69f75b16c852b70f5d6017568bbd72150a8fb193a99d0e9bdfa35df' 
  AND token = '898eRueWsr3j5IGo/yUf59SenPrAq/kKk45yA0xKd3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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