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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf88a0c4affd822cdcc4ea1b1aa3033e2fd55aea0cc8d29767a75ed728829516' 
  AND token = 'X09ClOqy6E0wGVOl9ONQ7HXAny+X9Eb04DqGksQRM6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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