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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea2c8c164924353b39751b8c1b3a77238108f45a9c8bb322762704ac0a7a4c96' 
  AND token = 'Tvpiucu0oJaPcsGnIN33muO97I4Wlg/uGaOsaCxh3Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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