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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5588d6d2016990aedcf826217f313b04feb69812754f173f1d37b7946af3fe4' 
  AND token = '6VFV2fwIAVqTZ2t+7mWuDynuoDNcylScmmV9sf4FtE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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