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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563b0f53d7cee655eb376aec45b2358733e00eda09fdcb38be195ca4d2369703' 
  AND token = '26dDvcBp2heN6zxpjkn4rIUGmHqbryWM2VVD4yYZFLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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