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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2805a18d7b9c14064af60994b805968edb1cabafa2bb2c165a451fc962d820b' 
  AND token = 'bYP+iweJnyeOYfDkteJsocC5nNpC70ZjPepQriMArgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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