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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '242c2fb1886abccd4eda43d613eac5ab79257b9f69d22496412fb673aa00d8ca' 
  AND token = 'sbmKjyGcfnD3lm1N9Okr2Euo+83iO2XAB4KfpGunfNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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