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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67f7fd4ca9babc1b3b318cfdab8384f9bac141c7e69f24b38c2d525950658051' 
  AND token = 'fjrCNIrH/sn3iScILgl43tUqIW2Y8ZrBjyRIes0LAKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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