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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf1ad67d470d634f256ff6148a97a5ee7b68683fc28d25df9b3ba0d7f1c83e7' 
  AND token = 'Xuu8mHtKtwDR2GIors75E4ELd42Dzs8Mq230S8wSN/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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