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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72ad59b383dac057e40ce92e5df0aa2efe9d56e2a4978cf0c68adcd3ade920e' 
  AND token = 'D3eDrHSy/06GjlPQs7qfJtGTCNW+H/5hpgKWejOAbWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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