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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5fc1e96656ae977f40868c7e8e0341587c456c8753a087a49190326ea68b2cd' 
  AND token = 'tsrwV/tN6ibOklXebNZnuv8Sz1nNA3BAJPoa+QCpdq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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