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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff5ad9803a38ff756422692a636cc49ed2e47bc75116de803734f71d2f8bee81' 
  AND token = '9cdDhtumJ3jt0mJXC9jEKFO62QXIFOU1ZaYmx7nuM8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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