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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d7edb6e9a37d6840ba6114b3dd0c6f2ad7e6984977ea86b07c622064d3d9927' 
  AND token = '4W/MWEEeRCbOj32+yuyYTSgArvNyClyx3P93p5fK/c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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