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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39c19e58d7a6b625d0d0fba461eed93014a4164360b17464f8b03524a5c37b21' 
  AND token = 'YUt989cMEEKd7FB0FUkYt4vN8yv9gAKFcHTnV3lQ33M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00098

JSON explain

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