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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed503abb73770e8c49b7559ad80e387b70523c5dbb696c49226a8c60532fd60' 
  AND token = 'QQdMbYKeBLxqhHw6lTFx6I+Py1EEbmz+5q32VCbtALQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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