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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230d406e9e16da061d8b1d414ca1b4149aa41c4dc3539e80ebc463ccbc389612' 
  AND token = 'DK7EMeR9JqN7P1nElT+Yo3WnS5UF364Ohbq6+vW/VC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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