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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86dcfa2ed9463a40362e5c34c3966c3c845bb2d60ee391482febd908a201c2f0' 
  AND token = 'BD4calI5QYUMWIlm9V6MCxjCN9CzWK8tuWq2Pn+HNOQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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