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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f81a8ed670a0462b0f35ad73a4fdebe4559d7e42e0f216fe9d4f1c2deab8697' 
  AND token = 'LZKBhBg2E4tOsHzAIV7iCQtxmSxjFh0KR3OxWo2tR9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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