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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b458977b9230c4345cfcd04d9548626f71745f078f10c6cbf86ff147d651391' 
  AND token = 'oy8ThCGtHonjDwf1SkjyeZDE3OpfckupABufuvaM8IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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