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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c49d9a18ac4a0d463c9e844428bc6d7102b38d2483358c24891fa2bbde9ecb8' 
  AND token = '2LCVpQ2xqgPrObZey/5PYkcchAVAaRkT7daHb6IOgIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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