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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a538e5dc5e70017681d1b22fdfa45fdf3c0a55591d32a6a1fae84b23b5def4b4' 
  AND token = 'SfJeKmBB2O9RBphbqGQjnsjWXqM8oNybzrq3q206ga0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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