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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad11e703cdeaa80ba95d6d170030ae0bcb8a9fb61b201b5e173f1613a395bab' 
  AND token = 'tJaQPBUdTsustp2RmKDh03K1hALQi/lSB7gK//lnIl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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