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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be71943c45c10f5c905a180ba71f0f4e115e9bbb89463e8b513afabbd5668a60' 
  AND token = 'nwDwqQffVh3yub2YcCzk0OOf9fGx4i8CtlXG+KGiHbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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