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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8b8fa229c69130b8c5bf33af9dbf1b3f0607b0ab9af3d6cb78dfc021287b5a' 
  AND token = 'j3ptE5O/elI2dUoiXHzp+N0l+YgZtjkzr48XDEXObnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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