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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d13843f1230037f606466b8ff376f5e7e7c85f700d0efbf6b75e0287d2754e9' 
  AND token = 'iFWs/fgk8XJZEwGIrxjrd4o0eCkcMVVo4/jAkbjB4+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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