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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d139c5bf0a1d29c4e3ccd562012f004601753cea94990e64057e8721c89cec1' 
  AND token = 'F+3ojnn25T78++JbVcjkwyiP8LapshOwme+flkdSlMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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