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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8144573f42bcd44c37210e82d605f383eb0f7dff53d1fde9189ba6663228f3f' 
  AND token = 'Xcj9buTtYUth8npK143EwmvcHwG2PhN7GyjMOIczaZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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