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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '041ae25265aca0b8af5c0fa01a79048e9f81a90551af83b435800a32245b3e04' 
  AND token = 'kOAtxfHp4C059i+TxK8dPYYcMDb6A0O2qaqpoqxPHZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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