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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf72d3e53fbbb795915d9bc897b9f3ff6fa29672a5f91b6ce72927ff559fa2cd' 
  AND token = 'NuB0m3v/b5He8CjgnqcxVLol7xvfSi1Hz9Oebd9pcFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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