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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bab0dbddb7a5bfe43d73f807bb370a81a3d5c35673c6fc4b02811c47e5ddd93' 
  AND token = '0aQvc1gVqg1/T2T6wFp5fMY5Glz0vs/1tBVM2ynY5qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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