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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f716993408a89bdcc3495caf584e47bc5cb0402ee9e15e828381b100a59014e6' 
  AND token = '5yQrxSpJtiaDxj0KCsPAiSa6FJNTesHlIUaiy4yvgAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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