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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199415e76d1d36c06f8231c54480379acf54ef82528ea443a52e97c13a5aaaf4' 
  AND token = 'YfNpf02xg3Qnf7aWqrk7f39vogebOrmkFJSeiQlc+B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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