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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c612d37dd3c425ba54800086f860f5b836b7a50806bfd944a8e7a4ebaf8d38f' 
  AND token = 'hNQ3EpCTbaFE4Cqf/z7ec1i6sYIx+VxLSv3iw4FHgkM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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