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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a672e6eba038cba7554757d3b927c67495851845e645d7a4117f0122f44befc5' 
  AND token = 'StfGT0oh/1DB51KIm2DZwRihuGR7Qx8plEU+v7Oget0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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