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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0090a6002b9d10aae5ec284cef836cd3382cf1ed7ff7a54f65d2e53461e67207' 
  AND token = 'e1z6JiWl3m37TwSFfI+yvEmcckhU9buRMctTDwVZVgI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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