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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e01471ae56e9779ed6202490ea6f30c922441730d3313e755ab00c68eb0cb7' 
  AND token = 'mM7uACmb9cK4oBKf4EHu3mTxeD1JIJHZGJRyhPR3Uog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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