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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2b494579c48d580bb1c020111d1f9248cdbdeb7cfe3d4eda2667830aaeb9f44' 
  AND token = 'sMiBG71Gu9+WqrouQkMqC2O6K/iis9s4MnT0I1gteos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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