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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69097926a5d8bd751971ceb861bccf95884a12644f146ebf5c91a877b37d17c2' 
  AND token = 'iF/GAaF8b9LsBi7QzNjOkj1d7J0OXxvISnUge/RNNfI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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