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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a3956aa639c0a7814da0dcd84c0225236f36d9ef1a6c14254dad001de7beb3' 
  AND token = 'SDSJz95mAl40KTP0CijvAxGEQ4S6FkQRGaZt8+wvp5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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