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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dece33a51e34687fc2fbaca16c6bc6298d885093e65ba2ee856cd16bbd14f706' 
  AND token = 'eFKdRUzHLrSa1nUCaBt6Bh1QsOjdjnCisD0/iK8R87k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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