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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9328371b8e2b85d7b71d9990e90bae6d7b321e7f306a047a6229e5143a41b249' 
  AND token = '38hzknvHgyKF9rIQiAFRVepFKicfgAr0SSmPC3Xx5Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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