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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc96f4e45b5b058bcff92a74fd481754157cf53fc2021d84e98e6fc5027ae23' 
  AND token = 'lBkMekKtnA10OG3PwGAL0G/QTQfVSIS4oI+1H7q8cKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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