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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c94fedaca0e16f2d6be9002c7d0038e94d1a47ba8ce0a95539bd49b2b3a6034' 
  AND token = 'HFZ7D6jddoPTrv2VbtvFyaJGPk4WsNiIxBHA/URpxMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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