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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a32c8a3bfaa6100cb78235df865d1440e2bbd8146445c93094972990824c138a' 
  AND token = 'ikn0uz49G+rY224OVCyD43CPYcGi7pKxUBLcEDYz0eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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