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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e04ca002e9e2aae5b9a24b4bd9c0fcc6e02e12a38d3d150b381ca4e62669e862' 
  AND token = 'jTZ9b4RTURfnc78LYPBI3mz726xLVkiKJ7kJfycZGTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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