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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b8846cf799d0268feb49a5edf7a173b3a03d67f0875363f14a746692037c85b' 
  AND token = '8gp3bhkP/zPDntpILz2ZaGqGOWbvQixbQ7l26tLdWuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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