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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b1f9673db10cc1ee251d2b0498c40ff0184089ab55d52702da34a8cbebd5b7' 
  AND token = 'vZfjl59C/7FM2/VJodMPcS+Wesh2z6n5YsPmtDMbroM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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